Telephone desk set.



C. L. CHISHOLM.

TELEPHONE DESK SET.

APPLICATION FILED APR.24,1911.

1 ,221 Patented Apr. 3, 1917.

3 SHEETSSHEET l.

WITNESSES C. L. CHISHOLM.

TELEPHONE DESK SET.

APPLICATION HLED APR. 24. 1911.

Patented Apr. 3, 1917.

3 SHEETS-SHEET 2- WITNESSES ATTORNEYS.

C. L. CHISHOLM.

TELEPHONE DESK SET.

APPLICATION FILED APR. 24. 1911.

1,221,678 Patents ad Apr. 3,1917.

3 SHEETS-SHEET 3.

S ll AWN CHARLES L. CHISHOLM, OF MARYSVILLE, NEW BRUNSXVICK, CANADA, ASSIGNOR T0 CHI-SI-IOLM TRANSMITTER & TELEPHONE INSTRUMENTS COMPANY.

TELEPHONE DESK SET.

Application filed April 24, 1911.

To all whom it may concern:

Be it known that I, Crrannns L. CHIS- .iroLM, a subject of the King of Great Britain, residing at Marysville, Province of New Brunswick, Canada, have invented a new and useful Telephone Desk Set, of which the following is a specification.

This invention has reference to improvements in telephones, and more particularly to improvements in desk sets wherein there is combined a telephone transmitter and receiver in compact and convenient form for use where it is desirable to move the set from place to place Within a limited area and at times to hold the transmitter to the mouth of the user.

Desk sets as ordinarily constructed in commercial installations are comparatively heavy structures due to their bulky construction and it is very tiresome to hold the portion of the desk set which remains after the receiver has been removed from the book, in a position where the weight is sustained Wholly by the hand of the user. Such desk sets comprise a basic member which is Weighted for stability and from this basic member there arises a column constituting a handhold, which column is surmounted by a transmitter casing of heavy and bulky construction. Furthermore, the receiver hook is located near the top of thecolumn and the mouth end of the receiver is, when the receiver is on the hook, some inches from the base of the desk set and usually considerably to one side of the center line of the base.

In the desk sets as found in commercial installations no attempt is made to minimize the weight of the desk setbut it is made of comparatively large size and because of the high position of heavy parts, notably the heavy receiver and the comparatively heavy transmitter, it becomes necessary to add considerable weight to the base to produce a low center of gravity and thus insure the stability of the set as a whole.

In accordance with the present invention the base and post are made of extreme lightness and by the employment of a transmitter of minute size the center of gravity of the structure even with the receiver is comparatively low. Furthermore, the ordinarv receiver is employed and the structure is so Specification of Letters Patent.

Patented Apr. 3, 1917. Serial No. 623,065.

side of the base instead of central thereto as in the case of the ordinarv commercial desk set. Since by having the mouth end of the receiver verv close to the top of the base the weight of the receiver brings the center of gravity of the'device correspondingly low. Because of the light weight of the transmitter and the small weight of all the parts combined with the exception of the receiver, the entire weight of the structure may be made less than double the weight of the receiver alone, so that the weight of the receiver is more than half the weight of the rest of the device and consequently the stability of the device is ample and the center of gravity is low, such center of gravity being further lowered by housing the usual induction coil or transformer coupled up to the receiver in 'the base of the device, and particularly on the side of the base remote from the post or standard, which latter also constitutes the handholdv The weight of the desk set after the removal of the receiver.

from the hook is so small as to be unnoticeable by the user even when a conversation is carried on for a considerable periodof time, the transmitter side of the desk set being held in the hand of the user during the conversation.

Since poor transmission is many times due to the packing of the granules in the microphonic transmitter, the telephone hook may be.utilized for the purpose of jarring the transmitter every time the receiver is lifted from thehook, thus depacking the transmitter should packing of the granules have occurred. It is also possible to utilize the call hell or signal means for depacking the granules and either structure is readily applicable to the desk set of the present inven tion without the addition of sutlicient weight to be noticeable, for even with these several parts added thetotal weight of the device exclusive of the receiver may still be less than half the weight of the receiver, the latter being necessarily of considerable weight due to the magnets employed.

The invention will be best understood from a consideration of the following detailed description taken in connection with of the depacker structure.

complete desk set with the receiver in place the accompanying drawings forming a part ofithls specification, but while the drawings illustrate a practical form of the invention it is not to be understood that the invention isat all limited to the construction shown,

but that such construction may be varied within such limits as'do not mark a departure from' the scope of the invention.

In the drawings z.-

Figure 1 is'a perspective view of the and showing a' depacker structure which may be employed.

Fig. 2 is a centrallongitudinal section through the structure along a diameter of the: base and standard or handhold and with the mouth piece of the transmitter re- 7 moved to avoid hiding the said transmitter.

Fig. 3 is an elevation of the. transmitter end of the desk set with the casing covering a portion of the'depacking mechanism in section.

Fig. at is a rear view of the structure of Fig. 3 with the casing omitted.

Fig. 5 is a perspective view of a portion Fig. 6 is an elevation of another form of depacker mechanism.

Fig. 7 is an elevation partly in section showing the adaptation of a signal means 7 for use as a'depaeker.

Fig. 8 is a plan view of a desk set of a form differing somewhat from the one shown in Fig. 1 and with the stem carrying'ithe transmitter omitted.

, Fig. 9 is an elevation of a portion of the it desk set shown in Fig. 8 with the base and V the lower end ofthe post shown in section on the line 99 of Fig. 8.

Fig. ,10 is a view similar to that of Fig. 8 but illustrating still another form of the base.

Referring to Figs. 1 and 2 there is shown a base 1 preferably, though not necessarily, of circular contour, and the edge of this base may be of any suitable shape, which is preferably, though not necessarily, ornaornamental edge be so shaped as to stiffen the base. By this means there is formed a chamber within the'base in which may be lodged an induction coil 4 supported by a bracket 5 or by any other means, this coil being located on the side of the base remote from the offset 2, but the presence of the coil 1 is not mandatory, although it adds to the stability of the structure. Within the base there is also a-bracket 6 carrying switch members 7, 8, respectively, in insulated relation one to the other, the construction being such that the switch member 8 which may be an elastic strip, has a normal tendency toward the switch member 7 and the range of movement of the switch member 8 is suilicient to cause contact between these two members by the movement of the switch member 8 under its normal tendency.

Erected on the oiiset 2 is a pedestal 9 carrying at the end remote from the offset 2 a hollow post 10 having at the end remote from the pedestal a cap 11 to which in turn is fastened a stem 12 located in substantially the longitudinal axis of the post 10 and rising from the cap 11, thence bent at an angle as shown at 13, and finally again bent into a portion 1 1 in substantially parallel offset relation to the main portion of the stem 12. The free end of the part 1 1 of the stem1-2 is formed into a head 15 straddled by the bifurcated end 16 of a neck 17, which at the end remote from the end 16 carries a transmitter 18 which in turn is provided with a mouth piece 19 of a size and shape similar to the mouth pieces usually provided for microphonic transmitters. The bifurcated end 16 of the neck 17 is held to the head 15 by a thumb screw 20, although this thumb screw may be replaced by a nut of other character, as is the common practice in swivel joints between the transmitter and its support in ordinary telephone practice.

The cap 11 is shown as provided with a neck 21 entering a short distance into the corresponding end of the tubular standard 10 and this neck carries a telephone hook 22 which may be shaped in accordance with the customary practice and extends through suitable slots 23, 2a in the neck 21 and post 10, respectively.

commercial form of receiver, and, therefor,

requires no particular description. The spring 8 1s sufliciently strong to elevate the telephone hook to approximately the posi- Extending from the telephone hook 22 within the neck 21 to the spring 8 1s a rod 25 passing through a guide 1 tion shown in Fig. 2 when the receiver is oil? the hook, but the weight of the receiver is sufiicient to depress the hook against the action of the spring 8 until the hook reaches the lower end of the slot 24; and the ear end of the receiver 28 is within, say, one-sixteenth of an inch or even closer to the top of the base 1, the structure being considered as resting upon a flat horizontal surface with the post 10 upright, this being the usual position of the telephone set when not in use.

Since it frequently happens that the granules in the microphonic element of the transmitter become packed and unless depacked the transmission is very inferior, the telephone set is provided with a depacking means of which one form is shown in Figs. 1 to 5, inclusive. Pivoted to one side of the bifurcated end 16 of the neck 17 by a pivot screw 29 is an arm 30 formed on one edge with a yoke 31. The arm 30 carries at the end remote from the pivot 29 a rod 32 ending in a knocker head 33 in position to engage the casing of the transmitter 18. The end of the arm 30 remote from the pivot 29 is beveled, as indicated at 34, and this beveled end is engaged by a spring 35 carried by the neck 17. lVhile not absolutely necessary, it is preferred to provide a guiding yoke 36 for the end of the arm 30 remote from the pivot 29, and this yoke may be made fast to the neck 17. In order to add to the appearance of this portion of the structure, the arm 30, retaining yoke 36, spring 35 and a portion of the rod 32 are inclosed in a suitable casing 37, but this casing is not mandatory.

Pivotcd at one end to the receiver hook 22 is a rod 38 bent into substantial conformity to the bent stem 12 and passing through guide clips 39 made fast at appropriate points to the stem 12, and its eX- tension 14, and this red 38 terminates in a pin 40 projecting into the space inclosed by the yoke 31. When the receiver hook is down the rod 38 is also moved down and the arm 30 is engaged by the pin 40 and likewise pulled down until the acute angle where the bevel 34 j oins the edge of the arm 30 is engaged by the spring 35, the pin 40 maintaining the arm 30 in such position against accidental movements, and in such position the knocker 33 is in spaced relation to the casing of the transmitter 18. If, now, the receiver be lifted from the hook the spring 8 acting through the rod moves the hook to the elevated position shown in Fig. 2, and this movement is transmitted to the rod 38 and the pin 40 is carried away from the arm toward the yoke 31, and when it reaches the yoke, which it does before the movement of the yoke 22 is completed, there is delivered to the yoke a blow which moves the beveled end 34 into such relation to the spring that the latter will react on the beveled end of the arm 30 in a manner to cause it to move until the spring lies flat against the beveled end 34, so that the ordinary movement imparted to the arm by the pin is augmented by the ac tion of the spring 35 on the beveled end 34 of the arm 30 and the knocker 33 is brought in sufliciently violent contact with the casing of the transmitter to jar any packed granules loose, but the spring 35 by its engagement with the beveled end 34 of the arm 3O locks such arm against return movement and the knocker 33 remains in contact with the casing of the transmitter after having performed its oilice. The knocker 33 may be of non-resonant material, or any material which will not mar the casing 18. When the receiver is again placed on the hook the latter is depressed and is followed by the rod 38 which then brings the pin 40 into engagement with the arm 30, and the latter is moved in a direction to carry the knocker 33 away from the transmitter 18 and the acute angle of the bevel 34 into its former relation to the spring 35.

The same operation is performed but differently in the structure of Fig. 6, where there is a bracket 41 made fast to the extension 14 of the stem 12, and this bracket has two extended members 42, 43, respectively, in spaced relation one to the other, the member 42 carrying an arm 44 by a pivot screw 45 and this arm has a beveled end 46 engaged by one end of a spring 47, the other end of which is carried by the extension 43. The end of the arm 44 remote from the beveled end 46 has a transverse slot 48 entered by a pin 49 on a rod 38 similar to the rod 38 of Fig. 1 but more nearly straight and requiring but one guide clip 39 carried by the main portion of the stem 12. The arm 44, which is in the form of a lever of the first order, carries a rod 50 on the free end of which is a knocker 51 similar to the knocker 33. In the structure shown in Fig. 6 the casing of the transmitter 18 is provided with a passage 52 in the path of the knocker 51, it being found in practice that this is ad vantageous.

In Fig. 7 there is shown a signal bell 53 mounted on the stem 17 carrying the transmitter 18, and this bell is set in vibration by a clapper 54 by any suitable electric bell operating device assumed to be inclosed in a casing 55, but since such operating device forms no part of the present invention it is not deemed necessary to illustrate it. When a signal is set, the clapper 54 is set in vibration and striking the bell 53 causes the latter to vibrate to emit a signal sound, and this vibration is imparted to the transmitter 13, depacking any packed granules therein.

The desk set substantially as shown in Figs. 1 and 2 in its commercial form weighs less than twicel as much as the receiver 28 alone. A commercial receiver weighs about fourteen ounces, while the entire desk set with the exception of the receiver weighs about thirteen ounces, or without the induction coil, about nine ounces, and by the employment of especially light metals may be made to weigh even less without any sacrifice of necessary strength or utility. The receiver being substantially central to the base member 1 and, close thereto nacts as a counterweight for the post 10. and parts carried thereby, the coil a when installed in the base. aiding in its counterbalancing effect,

' and the receiver brings the center of gravity so lowthat in practice the desk set has been found to be fully as stable as the heavy desk sets in common use, while weighing .but a small fraction of the weight of such sets.

The transmitter may be of a construction which I have devised, and while of minute and extremely light form is superior to transmitters as usually constructed and the weight of the transmitter'is so small that it adds nothing materially to the weight of the desk'set, and though mounted at the top of' beyond the peripheral line of the base, and

by making the handhold and parts carried thereby of hollow or shell construction, the base'being of comparatively broad extent will prevent. the tipping over of the device, even though the receiver be absent, but when the receiver is present its weight so adds to the stability of the structure that the likelihood of accidental overthrow of the desk set is almost wholly eliminated.

' While the receiver has been described as so hung that its hearing end is out of touch with but still very close to the top of the basic member, this does not preclude the actual touching of the base by the receiver, although it is preferred that the receiver be slightly spaced from the base since the small loss in stability is not noticeable to any material'extent and there is then no likelihood of accidentally jarring the receiver from the hook as might occur were the weight of the receiver not sustained by the hook. I

In Figs. 8 and 9 of the post 10 is shown as erected near the center of a base 1 which latter may in part be curved upon a center coincident with the longitudinal central axis of the-post 10. The base is formed with a reenteringportion 56 which may approach quite close to'the post 10 and on each side of this inset portion the base is provided with an extension 57 whereby the base is of substantially U form with the yoke of the U greatly widened. The inset portion 56 admits the hearing end of the receiver so that this end of the receiver may be brought into closerelation' to or actual coincidence with the plane of the bottom of'the base, but it is usually preferable that when the receiver is on the hook the receiving end be slightly elevated with relation to the plane 7 of the bottom of the base, so that when the structure is resting on a level or plane surface the hearing 'end of the receiver will be out of contact with such surface, although extending into the space provided .by the inset portion 56 of the base. When the receiver is on the hook, the extensions 57 are on opposite sidesof the receiver, and may diverge as indicated in Fig. 8 to form a broad support for this portion of the base,

thus contributing to the stability of the desk set, the center of gravity of which latter is brought very low by the close approach of the receiver to the plane of the bottom of the base. The form of the base shown in Fig. 8 permits the housing of the induction coil or transformer 4 within it.

Under some circumstances it is not necessary that the induction coil or transformer be housed within the base and under such circumstances the form of base shown in Fig. 10 may be employed, where there is illustrated a base 1" having a mentoring portion 56 with outstanding legs 57 and to the other side of the post 10 from the legs 57 are other legs 58 contributing toward the stability of the desk set by increasing the spread of the base without any material increase in the weight thereof.

The showing of Figs. 1, 8 and 10 with respect to the basic structure are deemed sufficient to indicate that the base or support ofthe desk set may be made in a great va riety of forms, while the stability of the desk set is made ample without any increase in the weight of the structure as a whole by the presence of the receiver, for in none of the forms illustrated is the total weight of the desk set any greater than double the weight of the receiver alone, and by a suitable arrangement of the parts, and if need be the omission of the transformer l, the

total weight including that of the receiver may be made materially less than double the weight of the receiver, and in practice may be kept within one pound and a half.

What is claimed is 1. A telephone desk set comprising a basic member, a post carrying a transmitter and erected on the basic member to one side of the center and closely adjacent to the margin thereof, a telephone hook carried by and projecting from the post in overlying relation to the basic member, and a telephone receiver adapted to the hook and when sustained by the latter hanging with its lower end close to the basic member and substantially within the area defined thereby and with its longitudinal center line substantially in line with the center of said basic member.

2. A telephone desk set comprising a transmitter and receiver, a portable support therefor consisting of a basic member having a side extension, a post erected on said side extension, a stem rising from the post and carrying the transmitter, and a receiver hook carried by and projecting from the post toward that side of the basic member remote from the side extension to permit the receiver when on the hook to override the basic member substantially central thereto.

3. A telephone desk set having a basic member and a transmitter and receiver supporting post thereon located at substantially the edge of the basic member and displaced from that side of said basic member remote from the post to an extent substantially that of the diameter of the hearing end of the telephone receiver.

a. A telephone desk set having a hollow base of substantially circular contour with a flat top and a side offset, a hollow post erected on the offset, a stem erected on the post and carrying the transmitter, and a telephone hook carried by the post and projecting therefrom toward that side of the base remote from the oifset in position to support a receiver with its hearing end overriding the flat top of the base in close relation to and within the bounds thereof.

5. A telephone desk set having a hollow base of substantially circular contour with a flat top and a side offset, a hollow post erected on the ofi'set and carrying a transmitter, and a receiver hook carried by the post and projecting therefrom toward that side of the base remote from the offset in position to support a receiver with the hearing end overriding the flat top of the base substantially concentric therewith.

6. A telephone desk set comprising a basic member, a post for carrying a transmitter erected on the basic member to one side of the center thereof, a telephone receiver hook carried by the post and projecting therefrom across the basic member to and beyond the center thereof, and a telephone receiver adapted to the hook, said hook being related to the basic member to carry a receiver pendently with the hearing end of the latter close to and over the center of said basic member.

7. A telephone desk set comprising a basic member, a post for carrying a transmitter rising from said basic member to one side of the center thereof, a telephone receiver, and a carrying member for the receiver in turn carried by the post and projecting therefrom across the basic member to and beyond the center of the latter in position to carry the telephone receiver with the hearing end close to and substantially concentric with the basic member, the weight of the receiver being greater than the combined weight of the other named parts of the desk set.

8. A telephone desk set comprising a basic member, a post for carrying a transmitter rising therefrom at the marginal portion of the basic member, a receiver hook on the post projecting therefrom across the basic member to and beyond the center of the latter, and a telephone receiver adapted to the receiver hook, the said hook being related to the basic member to support the receiver pendently with the then lower end of the receiver closely adjacent to the top of the basic member and substantially concentric therewith, the weight of the receiver alone being in excess of the combined Weight of the other named parts of the desk set.

In testimony that I claim the foregoing as my own, I have hereto affixed my signature in the presence of two witnesses.

CHARLES L. OHISHOLM.

Witnesses:

JOHN H. SIeeERs, DAVID R. WAGNER.

Gopies of this patent may be obtained fer five cents each, by addressing the Commissioner of Eatents, Washington, D. G. 

